Thanks!!
I assumed it had a buffer as my existing car had one.
My build date was 01.08.12 , is this dd/mm/yy ?

Yes, ETIS is the Ford Europe site so the date is in European format. My February 27, 2012 build date shows as 27.02.2012.

The first clue that the SiriusXM radio in the Focus has little or no buffer is how quickly the signal is lost when driving under an overpass or other signal obstruction. I've no idea why they would not have one, though, as every other satellite radio I've seen did at least a slight buffer.